On 28.10.2014, at 10:13, Julian Pawlowski <[email protected]> wrote:
> I was wondering if there is a way to have HAproxy check for an existing
> Cookie the client sends and have it verify with a specific backend (say
> backend1). Based on that backends HTTP error code (e.g. 200 or 403), HAproxy
> should allow forwarding to backend2. Of course this would need to be checked
> for every request but as this is not a high traffic site that wouldn’t be an
> issue.
Okay I guess I made some progress. Maybe that helps for somebody else to give
me a helping hand in completing this.
My primary backend application now once sends a customized header like these
after the user was successfully authorized:
X-APPNAME-AllowUser: APPSESSION=lkjhgsadkfjhsadjfhg
X-APPNAME-Validity: <UNIXTIMESTAMP-until-session-ends>
Location: /backend2
I think I can now add some ACLs in the HAproxy configuration of my primary
backend:
acl allowAPPNAMEUser res.hdr(X-APPNAME-AllowUser) -m found
acl disallowAPPNAMEUser res.hdr(X-APPNAME-DisallowUser) -m found
http-response set-map(/var/lib/haproxy/appname_user_sessions.lst)
%[res.hdr(X-APPNAME-AllowUser)] %[res.hdr(X-APPNAME-Validity)] if
allowAPPNAMEUser
http-response del-map(/var/lib/haproxy/appname_user_sessions.lst)
%[res.hdr(X-APPNAME-DisallowUser)] if disallowAPPNAMEUser
I tried these but don’t know if they are actually working cause I wasn’t able
to get anything about it from the logfiles.
Also the map files are not written, even though I created empty files and
ensured r/w access for the HAproxy daemon user.
For /backend2, I think I might just need to add an ACL to my frontend similar
to this but I’m not sure:
use_backend bk_backend2 if {
hdr_sub(cookie),map_str(/var/lib/haproxy/appname_user_sessions.lst) -m found }
About session expiration: I think I cannot have HAproxy make any cleanups on
it’s own beside using the info should a user explicitly use the logout function
via the primary backend (X-APPNAME-DisallowUser ...). The plan is to have a
cronjob running cleaning the appname_user_sessions.lst based on the second
column I added from X-APPNAME-Validity header.
However, I’m still stuck into this somehow.
Any help would be very much appreciated (it’s for an OpenSource project if that
counts).
Many thanks in advance.
Julian
